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R. IVII WITHYCOIVIBE.

ARTIFICIAL TOOTH.v

APPLICATION FILI-:D sEPT.24. 1915k Lw@ mentaal Aug. 19m.

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ROBERT MORSE WITHYCOMBE, `OIF SYDNEY, NEW SOUTH AUSTRALIA,

ARTIFICIAL TOOTH.

To all who/m, it may concern Be it known that I, ROBERT Mensa WITHYCOMBE, a subject of the King of Great of mastication in substantially the same kinds and forms, 1s especiallyadapted ,tof-.

manner that a natural tooth works in itsalveolar ocket. l

'llhe o jects of the invention, brief-lystated, are to provide an' internally arran ed means for anchoring the tooth in its soc etl whereby the appearance of the tooth 1s improved and the tooth is lheld with greater security; and to provide an anc orage means which, whileapplicable to teeth of all diatoric teeth in that its application theretg' involves the utilization of the datoric openings and the internal bore with which said teeth are provided.

Embodiments of the invention are illustrated inthe accompanying drawings wherein the invention is shown in Figures 1 to 4 in its application to diatoric teeth and Fig. 1 is a sectional view showing one form of anchorage mea-ns. Fig. 2 is a sectional view showing another form of anchorage means. Fig. 3 1s a sectional View showing a third form of anchorage means. Fig. t is a sectional view, showing a fourth form oiv anchorage means. Fig. 5: is a sectional view showing the application of the invention to a tooth of special shape wherein the anchorage means is embeddedin the tooth at the Vtime that the latter is made.

Similar characters of reference designate corresponding parts throughout the several views. v v

Diatoric teeth Aare provided with a diatorio l opening 1 some -distance below their occlusal surface which extends transversely or in the direction of the minor axes thereof, whichy said opening at its center communicates Specification of Letters Patent. Patented Aug. 1, 1916. application inea 'september 24,1915. serial No. saaie.-A p .l

with a centrally arranged bore 2 of enlarged diameter extending to the under face of the tooth, the opening 1 and the bore 2. conjointly providing a Tshaped cavity which is usually filled wlth the rubber of the plate or with retaining cement, the material thus llhng the sa1d cavity keying the tooth inl position.

According to the present invention, an iny ternal anchorage means, generally designated as 3, is interposed between the tooth and the base of the socket in which the tooth is fitted and securely lixes thetooth against displacement from` the said socket, the

socket being either the seat or opening in the plate which receives the tooth or the' collar which receives the tooth in crown and bridge work. A cushioning medium 4: of soft vulcanized rubber is interposed between the under face of the tooth and the base of the socket.

An essential characteristic of the anchorage means 3 is that, although securely fixing the tooth against displacement from its -Socket, it permits of' a slight yieldin of the vtooth in the act of mastication fort e pur` poses'fully set forth in my prior patent herein Yreferred to. ISeveral forms of an vcllorage means having these characteristics. `lare available and the different forms shown #in the drawings are to as examples.

be regarded merely Where the special shape ofthe" tooth prevents it from being made 1n diatric form,

.the anchorage means may be readily at` tached to the tooth by-having aportion of vits vlength secured therein, as shown in Fi 5. A similar vprocedure may be followed 1n teeth whose shape admits of their being made in diatoric form but where the use of the resent invention makes the diatoric openings unnecessary.

Figs. 1 to 4 of the drawings show the'invention in its application to ordinary diatoric teeth. According to Fig. 1, the 'anchorage means 3 consists oa pin or bar 5 which is inserted through the diatoric opening 1 and a chain 6 which extends through the'bore 2 and has its inner end connected to the bar 5. The outer end` of the chain is fixedly secured by solder or otherwise tothe base of the socket in which the tooth works.

base of the socket. inthe manner stated,

,After the chain has beenconnected to the l.

vellum rubber is introducedI into the'socket Abetween the base thereof and the inner face of the tooth, and, upon vulcanization, completely fills the bore 2 and the opening 1,

thereby establishing a secure bond between' the tooth and its anchorage means. Since this rubber, when vulcanized, has resilient properties, the resultant cushion 4 answers 'the requirements'of the rubber cushion de scribed in myprior patent herein referred.

to. This rubber may be introduced into the socket in any suitable mannenbut it is -preferably introduced through an opening in the base of the socket and the opening is sealed in any suitable manner after the rubber has been introduced. According to Fig. 2, a har 1k1 is arranged-in the diatoric opening and is provided with a central V-shaped portion lb which extends into or through the 4bore 2 and to which 'the' inner end of the chain is connected. In other respects, the constructionshown in Fig. 2 is similar to that 'of Fig. 1,v According to fFig. 3, the socket in which the tooth works has its base provided with inwardly projecting prongs 'Z having out-turned extremities ing l. The construction shown in Fig. fi is similar to the construction shown in Figa i.

except thata spiral spring 6a is substituted for the chain 6.

vFrom theforegoing description it will be l Vseen that the present invention provides for l v. -the secure retention of the tooth in its socket withoutf the aid of the groove or 'apron around the base of the tooth into which the coliarwhich forms the wall of the socket is "burnished, as in'. the existing practice. ,It

will also be .apparent that where a dentist or 'a dental supply house has on hand a supply off diatoric teeth, the invention may be readily applied to these existin teeth without anyichanges in the latter, ythe adop- ,age'means, whether incorporated in a tooth '-andby virtue of this y tion. of any of the forms of construction zherein disclosed, or otherv forms falling. l'Within the scope of the invention and of the appended claims.- v

Y In all forms ofthe invention the anchordurng-th'ej'making thereof, as in Fig 5 '01' whether applied` to a diatoric tooth, in thev manner described, is secured inthe tooth,v

relation*2 the toothfis [not only fixed with security in its socket, but` the avoidance of sepsis is promoted.

. claim-V 1. An artificial-tooth structure comprising a socketedtooth supporting memocna tooth fitted therein, an anch Y orage means arranged internallyof said `socket-and secured -V The prongs 7 extend through the bore 2 and its angular extremities 7a project into the openu Having fullydescribed my invention, I,

in the tooth, the means connecting awall of the socket and the tooth to prevent displacement of the tooth from said socket, and permitting a slight yielding of the tooth, and

'a yielding cushion arranged within said socket, at the bottom thereof, the tooth having its base disposed directly against said cushion.

2. An artificial Vtooth structure comprising a socketed tooth supporting member, a tooth fitted therein, a yieldahle anchorage means arranged internally of said socketA and secured in the tooth, the means connecting a wall of the socket and the tooth. to

prevent displacementfo the tooth from said socket, and aV yielding cushion arranged Within said socket, at the bottom thereof, the tooth having its base disposed directly against said cushion.

3. An artificial tooth structure comprising a socketed tooth supporting member, a

diatoric tooth fitted therein andv having a transverse opening below its occlusal tace and a central' fbore extending from said opening .to its inner yface', an anchorage means arranged internally of said socket and comprising connected parts disposed in said opening and in said bore, the anchor'u age means being connected to a wall of said socket and preventing displacement of the tooth from the socket while permitting a slight yielding of the tooth, and a yielding' cushion arranged within said socket at the bottom thereof, the material of saidcushion lling said openin and said bore the tooth having its base isposed directly against said cushion.

4. An artiiicialtooth structure compris' ing a socketed tooth supporting member, a diatoric tooth tted therein land having a transverseopening below its occlusal face and. a central bore extending from said opening toits inner face, an anchorage means arranged internally of said socket and comprising a bar in said opening and a part of yielding construction in said. bore rico connected to said bar'and to the hase'of the 

